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Endogenetic forces (Different types of foldings (Symmetrical folds…
Endogenetic forces
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Folding results into
Rift Valley - represents a trough, depression or basin between two crustal parts.
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Formed due to movement of Rock blocks in two opposite directions( upward or downward) due to tensional forces
They are long and narrow called grabbin in German, Dead Sea of Jordan located in rift Valley
Ramp Valleys - formed when the middle portion between two fold planes remain at its place but due to compressional forces the two side Rock blocks rise upwards example Brahmaputra Valley
Block mountains - when middle portion remains at its place and the two side blocks move downwards example Satpura mountains in India black forest and vosges in Germany
Horst mountains - when two side block of a fault remain at their places but the middle block Rises along the fault
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Example plateau, mountain, plane, lakes, faults, folds etc.
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Nappe -When Limbs of recumbent fold breaks and moves some distance overriding rock beds Example Kashmir Valley
Fanfold -Represent an extensive and broad fold consisting of several minor anticlines and synclines called anticlinorium and synclinorium